nodejs agent/request 5 connections limit (?) when piping to file

gistfile1.js

var http = require('http');
var fs = require('fs');
var request = require('request');
var parseUrl  = require("url").parse;

var i = 100;
while(i > 0) {
  r = request({"uri": parseUrl("http://farm4.static.flickr.com/3557/3670453345_c38d482efb_m.jpg", true), "maxSockets": 3}, function (error, response, body) {
    console.log(i);
  })
  r.pipe(fs.createWriteStream(i + ".jpg"))
  i--;
}